Breach of Contract

Thanks once again Vodacom... I refer to your ref: EC-0W6P-3NAQ2V. I requested a premature cancellation on behalf of my dad (the deceased) and paid up in full amount due R 1,547.97 and was advised that no outstanding amount would be due to yourselves and his number would be deleted from the network ...which confirmation was received 16 April 2015. Please explain where the amount of R 875.60 comes from as we owe you nothing. You debited my dads account on the 30 April with this amount and when i queried today i was told that its for \usage"between the 3rd to 16th of April ...utterly nonsense!. I am truly disgusted on how you have dealt with this situation ... Sorry for you but you have drawn the line 19 years of us being loyal to you ... You have lost 3 contracts (2 personal capacity and 1 business) I would be ashamed!... Carry on ... well done!!! """